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ARE THE INS BOXES ONLY AVAILABLE FROM SERPENT. DOES RB HAVE A SIMILAR PRODUCT. WHAT KIND OF NOISE REDUCTION CAN I EXPECT. WHAT IS TOTAL OUTSIDE DIAMETER, (NEED TO CUT LARGER HOLE ON BODY). ARE THEY REALLY WORTH THE MONEY.
DONT GET ME WRONG, I AM ALL FOR THEM, BUT THEY ARE NOT AVAILABLE ANYWHERE OVER HERE.